1 | /* ssl/s3_enc.c */ |
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2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
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3 | * All rights reserved. |
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4 | * |
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5 | * This package is an SSL implementation written |
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6 | * by Eric Young (eay@cryptsoft.com). |
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7 | * The implementation was written so as to conform with Netscapes SSL. |
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8 | * |
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9 | * This library is free for commercial and non-commercial use as long as |
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10 | * the following conditions are aheared to. The following conditions |
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11 | * apply to all code found in this distribution, be it the RC4, RSA, |
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12 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation |
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13 | * included with this distribution is covered by the same copyright terms |
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14 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). |
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15 | * |
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16 | * Copyright remains Eric Young's, and as such any Copyright notices in |
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17 | * the code are not to be removed. |
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18 | * If this package is used in a product, Eric Young should be given attribution |
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19 | * as the author of the parts of the library used. |
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20 | * This can be in the form of a textual message at program startup or |
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21 | * in documentation (online or textual) provided with the package. |
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22 | * |
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23 | * Redistribution and use in source and binary forms, with or without |
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24 | * modification, are permitted provided that the following conditions |
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25 | * are met: |
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26 | * 1. Redistributions of source code must retain the copyright |
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27 | * notice, this list of conditions and the following disclaimer. |
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28 | * 2. Redistributions in binary form must reproduce the above copyright |
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29 | * notice, this list of conditions and the following disclaimer in the |
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30 | * documentation and/or other materials provided with the distribution. |
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31 | * 3. All advertising materials mentioning features or use of this software |
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32 | * must display the following acknowledgement: |
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33 | * "This product includes cryptographic software written by |
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34 | * Eric Young (eay@cryptsoft.com)" |
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35 | * The word 'cryptographic' can be left out if the rouines from the library |
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36 | * being used are not cryptographic related :-). |
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37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
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38 | * the apps directory (application code) you must include an acknowledgement: |
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39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
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40 | * |
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41 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
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42 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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43 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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44 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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45 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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46 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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47 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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49 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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50 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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51 | * SUCH DAMAGE. |
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52 | * |
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53 | * The licence and distribution terms for any publically available version or |
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54 | * derivative of this code cannot be changed. i.e. this code cannot simply be |
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55 | * copied and put under another distribution licence |
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56 | * [including the GNU Public Licence.] |
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57 | */ |
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58 | /* ==================================================================== |
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59 | * Copyright (c) 1998-2002 The OpenSSL Project. All rights reserved. |
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60 | * |
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61 | * Redistribution and use in source and binary forms, with or without |
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62 | * modification, are permitted provided that the following conditions |
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63 | * are met: |
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64 | * |
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65 | * 1. Redistributions of source code must retain the above copyright |
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66 | * notice, this list of conditions and the following disclaimer. |
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67 | * |
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68 | * 2. Redistributions in binary form must reproduce the above copyright |
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69 | * notice, this list of conditions and the following disclaimer in |
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70 | * the documentation and/or other materials provided with the |
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71 | * distribution. |
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72 | * |
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73 | * 3. All advertising materials mentioning features or use of this |
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74 | * software must display the following acknowledgment: |
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75 | * "This product includes software developed by the OpenSSL Project |
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76 | * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" |
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77 | * |
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78 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
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79 | * endorse or promote products derived from this software without |
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80 | * prior written permission. For written permission, please contact |
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81 | * openssl-core@openssl.org. |
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82 | * |
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83 | * 5. Products derived from this software may not be called "OpenSSL" |
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84 | * nor may "OpenSSL" appear in their names without prior written |
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85 | * permission of the OpenSSL Project. |
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86 | * |
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87 | * 6. Redistributions of any form whatsoever must retain the following |
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88 | * acknowledgment: |
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89 | * "This product includes software developed by the OpenSSL Project |
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90 | * for use in the OpenSSL Toolkit (http://www.openssl.org/)" |
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91 | * |
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92 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
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93 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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94 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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95 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR |
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96 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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97 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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98 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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99 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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100 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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101 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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102 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
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103 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
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104 | * ==================================================================== |
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105 | * |
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106 | * This product includes cryptographic software written by Eric Young |
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107 | * (eay@cryptsoft.com). This product includes software written by Tim |
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108 | * Hudson (tjh@cryptsoft.com). |
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109 | * |
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110 | */ |
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111 | |
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112 | #include <stdio.h> |
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113 | #include "ssl_locl.h" |
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114 | #include <openssl/evp.h> |
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115 | #include <openssl/md5.h> |
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116 | |
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117 | static unsigned char ssl3_pad_1[48]={ |
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118 | 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, |
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119 | 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, |
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120 | 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, |
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121 | 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, |
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122 | 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, |
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123 | 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36 }; |
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124 | |
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125 | static unsigned char ssl3_pad_2[48]={ |
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126 | 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, |
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127 | 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, |
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128 | 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, |
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129 | 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, |
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130 | 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, |
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131 | 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c }; |
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132 | |
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133 | static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx, |
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134 | const char *sender, int len, unsigned char *p); |
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135 | |
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136 | static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num) |
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137 | { |
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138 | EVP_MD_CTX m5; |
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139 | EVP_MD_CTX s1; |
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140 | unsigned char buf[16],smd[SHA_DIGEST_LENGTH]; |
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141 | unsigned char c='A'; |
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142 | int i,j,k; |
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143 | |
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144 | #ifdef CHARSET_EBCDIC |
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145 | c = os_toascii[c]; /*'A' in ASCII */ |
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146 | #endif |
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147 | k=0; |
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148 | EVP_MD_CTX_init(&m5); |
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149 | EVP_MD_CTX_init(&s1); |
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150 | for (i=0; i<num; i+=MD5_DIGEST_LENGTH) |
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151 | { |
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152 | k++; |
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153 | if (k > sizeof buf) |
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154 | { |
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155 | /* bug: 'buf' is too small for this ciphersuite */ |
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156 | SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR); |
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157 | return 0; |
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158 | } |
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159 | |
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160 | for (j=0; j<k; j++) |
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161 | buf[j]=c; |
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162 | c++; |
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163 | EVP_DigestInit_ex(&s1,EVP_sha1(), NULL); |
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164 | EVP_DigestUpdate(&s1,buf,k); |
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165 | EVP_DigestUpdate(&s1,s->session->master_key, |
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166 | s->session->master_key_length); |
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167 | EVP_DigestUpdate(&s1,s->s3->server_random,SSL3_RANDOM_SIZE); |
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168 | EVP_DigestUpdate(&s1,s->s3->client_random,SSL3_RANDOM_SIZE); |
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169 | EVP_DigestFinal_ex(&s1,smd,NULL); |
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170 | |
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171 | EVP_DigestInit_ex(&m5,EVP_md5(), NULL); |
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172 | EVP_DigestUpdate(&m5,s->session->master_key, |
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173 | s->session->master_key_length); |
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174 | EVP_DigestUpdate(&m5,smd,SHA_DIGEST_LENGTH); |
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175 | if ((i+MD5_DIGEST_LENGTH) > num) |
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176 | { |
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177 | EVP_DigestFinal_ex(&m5,smd,NULL); |
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178 | memcpy(km,smd,(num-i)); |
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179 | } |
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180 | else |
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181 | EVP_DigestFinal_ex(&m5,km,NULL); |
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182 | |
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183 | km+=MD5_DIGEST_LENGTH; |
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184 | } |
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185 | OPENSSL_cleanse(smd,SHA_DIGEST_LENGTH); |
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186 | EVP_MD_CTX_cleanup(&m5); |
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187 | EVP_MD_CTX_cleanup(&s1); |
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188 | return 1; |
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189 | } |
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190 | |
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191 | int ssl3_change_cipher_state(SSL *s, int which) |
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192 | { |
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193 | unsigned char *p,*key_block,*mac_secret; |
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194 | unsigned char exp_key[EVP_MAX_KEY_LENGTH]; |
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195 | unsigned char exp_iv[EVP_MAX_IV_LENGTH]; |
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196 | unsigned char *ms,*key,*iv,*er1,*er2; |
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197 | EVP_CIPHER_CTX *dd; |
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198 | const EVP_CIPHER *c; |
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199 | COMP_METHOD *comp; |
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200 | const EVP_MD *m; |
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201 | EVP_MD_CTX md; |
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202 | int exp,n,i,j,k,cl; |
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203 | int reuse_dd = 0; |
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204 | |
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205 | exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher); |
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206 | c=s->s3->tmp.new_sym_enc; |
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207 | m=s->s3->tmp.new_hash; |
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208 | if (s->s3->tmp.new_compression == NULL) |
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209 | comp=NULL; |
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210 | else |
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211 | comp=s->s3->tmp.new_compression->method; |
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212 | key_block=s->s3->tmp.key_block; |
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213 | |
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214 | if (which & SSL3_CC_READ) |
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215 | { |
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216 | if (s->enc_read_ctx != NULL) |
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217 | reuse_dd = 1; |
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218 | else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) |
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219 | goto err; |
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220 | dd= s->enc_read_ctx; |
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221 | s->read_hash=m; |
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222 | /* COMPRESS */ |
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223 | if (s->expand != NULL) |
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224 | { |
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225 | COMP_CTX_free(s->expand); |
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226 | s->expand=NULL; |
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227 | } |
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228 | if (comp != NULL) |
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229 | { |
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230 | s->expand=COMP_CTX_new(comp); |
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231 | if (s->expand == NULL) |
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232 | { |
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233 | SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); |
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234 | goto err2; |
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235 | } |
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236 | if (s->s3->rrec.comp == NULL) |
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237 | s->s3->rrec.comp=(unsigned char *) |
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238 | OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH); |
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239 | if (s->s3->rrec.comp == NULL) |
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240 | goto err; |
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241 | } |
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242 | memset(&(s->s3->read_sequence[0]),0,8); |
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243 | mac_secret= &(s->s3->read_mac_secret[0]); |
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244 | } |
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245 | else |
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246 | { |
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247 | if (s->enc_write_ctx != NULL) |
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248 | reuse_dd = 1; |
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249 | else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) |
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250 | goto err; |
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251 | dd= s->enc_write_ctx; |
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252 | s->write_hash=m; |
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253 | /* COMPRESS */ |
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254 | if (s->compress != NULL) |
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255 | { |
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256 | COMP_CTX_free(s->compress); |
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257 | s->compress=NULL; |
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258 | } |
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259 | if (comp != NULL) |
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260 | { |
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261 | s->compress=COMP_CTX_new(comp); |
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262 | if (s->compress == NULL) |
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263 | { |
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264 | SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); |
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265 | goto err2; |
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266 | } |
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267 | } |
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268 | memset(&(s->s3->write_sequence[0]),0,8); |
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269 | mac_secret= &(s->s3->write_mac_secret[0]); |
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270 | } |
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271 | |
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272 | if (reuse_dd) |
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273 | EVP_CIPHER_CTX_cleanup(dd); |
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274 | EVP_CIPHER_CTX_init(dd); |
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275 | |
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276 | p=s->s3->tmp.key_block; |
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277 | i=EVP_MD_size(m); |
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278 | cl=EVP_CIPHER_key_length(c); |
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279 | j=exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ? |
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280 | cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl; |
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281 | /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */ |
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282 | k=EVP_CIPHER_iv_length(c); |
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283 | if ( (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) || |
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284 | (which == SSL3_CHANGE_CIPHER_SERVER_READ)) |
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285 | { |
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286 | ms= &(p[ 0]); n=i+i; |
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287 | key= &(p[ n]); n+=j+j; |
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288 | iv= &(p[ n]); n+=k+k; |
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289 | er1= &(s->s3->client_random[0]); |
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290 | er2= &(s->s3->server_random[0]); |
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291 | } |
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292 | else |
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293 | { |
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294 | n=i; |
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295 | ms= &(p[ n]); n+=i+j; |
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296 | key= &(p[ n]); n+=j+k; |
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297 | iv= &(p[ n]); n+=k; |
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298 | er1= &(s->s3->server_random[0]); |
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299 | er2= &(s->s3->client_random[0]); |
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300 | } |
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301 | |
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302 | if (n > s->s3->tmp.key_block_length) |
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303 | { |
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304 | SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR); |
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305 | goto err2; |
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306 | } |
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307 | |
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308 | EVP_MD_CTX_init(&md); |
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309 | memcpy(mac_secret,ms,i); |
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310 | if (exp) |
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311 | { |
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312 | /* In here I set both the read and write key/iv to the |
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313 | * same value since only the correct one will be used :-). |
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314 | */ |
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315 | EVP_DigestInit_ex(&md,EVP_md5(), NULL); |
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316 | EVP_DigestUpdate(&md,key,j); |
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317 | EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE); |
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318 | EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE); |
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319 | EVP_DigestFinal_ex(&md,&(exp_key[0]),NULL); |
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320 | key= &(exp_key[0]); |
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321 | |
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322 | if (k > 0) |
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323 | { |
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324 | EVP_DigestInit_ex(&md,EVP_md5(), NULL); |
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325 | EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE); |
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326 | EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE); |
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327 | EVP_DigestFinal_ex(&md,&(exp_iv[0]),NULL); |
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328 | iv= &(exp_iv[0]); |
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329 | } |
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330 | } |
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331 | |
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332 | s->session->key_arg_length=0; |
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333 | |
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334 | EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE)); |
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335 | |
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336 | OPENSSL_cleanse(&(exp_key[0]),sizeof(exp_key)); |
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337 | OPENSSL_cleanse(&(exp_iv[0]),sizeof(exp_iv)); |
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338 | EVP_MD_CTX_cleanup(&md); |
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339 | return(1); |
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340 | err: |
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341 | SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE); |
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342 | err2: |
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343 | return(0); |
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344 | } |
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345 | |
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346 | int ssl3_setup_key_block(SSL *s) |
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347 | { |
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348 | unsigned char *p; |
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349 | const EVP_CIPHER *c; |
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350 | const EVP_MD *hash; |
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351 | int num; |
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352 | int ret = 0; |
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353 | SSL_COMP *comp; |
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354 | |
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355 | if (s->s3->tmp.key_block_length != 0) |
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356 | return(1); |
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357 | |
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358 | if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp)) |
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359 | { |
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360 | SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE); |
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361 | return(0); |
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362 | } |
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363 | |
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364 | s->s3->tmp.new_sym_enc=c; |
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365 | s->s3->tmp.new_hash=hash; |
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366 | s->s3->tmp.new_compression=comp; |
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367 | |
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368 | num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c); |
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369 | num*=2; |
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370 | |
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371 | ssl3_cleanup_key_block(s); |
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372 | |
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373 | if ((p=OPENSSL_malloc(num)) == NULL) |
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374 | goto err; |
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375 | |
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376 | s->s3->tmp.key_block_length=num; |
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377 | s->s3->tmp.key_block=p; |
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378 | |
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379 | ret = ssl3_generate_key_block(s,p,num); |
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380 | |
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381 | if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)) |
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382 | { |
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383 | /* enable vulnerability countermeasure for CBC ciphers with |
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384 | * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt) |
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385 | */ |
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386 | s->s3->need_empty_fragments = 1; |
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387 | |
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388 | if (s->session->cipher != NULL) |
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389 | { |
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390 | if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_eNULL) |
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391 | s->s3->need_empty_fragments = 0; |
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392 | |
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393 | #ifndef OPENSSL_NO_RC4 |
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394 | if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_RC4) |
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395 | s->s3->need_empty_fragments = 0; |
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396 | #endif |
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397 | } |
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398 | } |
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399 | |
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400 | return ret; |
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401 | |
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402 | err: |
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403 | SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE); |
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404 | return(0); |
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405 | } |
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406 | |
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407 | void ssl3_cleanup_key_block(SSL *s) |
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408 | { |
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409 | if (s->s3->tmp.key_block != NULL) |
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410 | { |
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411 | OPENSSL_cleanse(s->s3->tmp.key_block, |
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412 | s->s3->tmp.key_block_length); |
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413 | OPENSSL_free(s->s3->tmp.key_block); |
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414 | s->s3->tmp.key_block=NULL; |
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415 | } |
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416 | s->s3->tmp.key_block_length=0; |
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417 | } |
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418 | |
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419 | int ssl3_enc(SSL *s, int send) |
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420 | { |
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421 | SSL3_RECORD *rec; |
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422 | EVP_CIPHER_CTX *ds; |
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423 | unsigned long l; |
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424 | int bs,i; |
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425 | const EVP_CIPHER *enc; |
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426 | |
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427 | if (send) |
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428 | { |
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429 | ds=s->enc_write_ctx; |
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430 | rec= &(s->s3->wrec); |
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431 | if (s->enc_write_ctx == NULL) |
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432 | enc=NULL; |
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433 | else |
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434 | enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx); |
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435 | } |
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436 | else |
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437 | { |
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438 | ds=s->enc_read_ctx; |
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439 | rec= &(s->s3->rrec); |
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440 | if (s->enc_read_ctx == NULL) |
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441 | enc=NULL; |
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442 | else |
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443 | enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx); |
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444 | } |
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445 | |
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446 | if ((s->session == NULL) || (ds == NULL) || |
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447 | (enc == NULL)) |
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448 | { |
---|
449 | memmove(rec->data,rec->input,rec->length); |
---|
450 | rec->input=rec->data; |
---|
451 | } |
---|
452 | else |
---|
453 | { |
---|
454 | l=rec->length; |
---|
455 | bs=EVP_CIPHER_block_size(ds->cipher); |
---|
456 | |
---|
457 | /* COMPRESS */ |
---|
458 | |
---|
459 | if ((bs != 1) && send) |
---|
460 | { |
---|
461 | i=bs-((int)l%bs); |
---|
462 | |
---|
463 | /* we need to add 'i-1' padding bytes */ |
---|
464 | l+=i; |
---|
465 | rec->length+=i; |
---|
466 | rec->input[l-1]=(i-1); |
---|
467 | } |
---|
468 | |
---|
469 | if (!send) |
---|
470 | { |
---|
471 | if (l == 0 || l%bs != 0) |
---|
472 | { |
---|
473 | SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG); |
---|
474 | ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED); |
---|
475 | return 0; |
---|
476 | } |
---|
477 | } |
---|
478 | |
---|
479 | EVP_Cipher(ds,rec->data,rec->input,l); |
---|
480 | |
---|
481 | if ((bs != 1) && !send) |
---|
482 | { |
---|
483 | i=rec->data[l-1]+1; |
---|
484 | /* SSL 3.0 bounds the number of padding bytes by the block size; |
---|
485 | * padding bytes (except that last) are arbitrary */ |
---|
486 | if (i > bs) |
---|
487 | { |
---|
488 | /* Incorrect padding. SSLerr() and ssl3_alert are done |
---|
489 | * by caller: we don't want to reveal whether this is |
---|
490 | * a decryption error or a MAC verification failure |
---|
491 | * (see http://www.openssl.org/~bodo/tls-cbc.txt) */ |
---|
492 | return -1; |
---|
493 | } |
---|
494 | rec->length-=i; |
---|
495 | } |
---|
496 | } |
---|
497 | return(1); |
---|
498 | } |
---|
499 | |
---|
500 | void ssl3_init_finished_mac(SSL *s) |
---|
501 | { |
---|
502 | EVP_DigestInit_ex(&(s->s3->finish_dgst1),s->ctx->md5, NULL); |
---|
503 | EVP_DigestInit_ex(&(s->s3->finish_dgst2),s->ctx->sha1, NULL); |
---|
504 | } |
---|
505 | |
---|
506 | void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len) |
---|
507 | { |
---|
508 | EVP_DigestUpdate(&(s->s3->finish_dgst1),buf,len); |
---|
509 | EVP_DigestUpdate(&(s->s3->finish_dgst2),buf,len); |
---|
510 | } |
---|
511 | |
---|
512 | int ssl3_cert_verify_mac(SSL *s, EVP_MD_CTX *ctx, unsigned char *p) |
---|
513 | { |
---|
514 | return(ssl3_handshake_mac(s,ctx,NULL,0,p)); |
---|
515 | } |
---|
516 | |
---|
517 | int ssl3_final_finish_mac(SSL *s, EVP_MD_CTX *ctx1, EVP_MD_CTX *ctx2, |
---|
518 | const char *sender, int len, unsigned char *p) |
---|
519 | { |
---|
520 | int ret; |
---|
521 | |
---|
522 | ret=ssl3_handshake_mac(s,ctx1,sender,len,p); |
---|
523 | p+=ret; |
---|
524 | ret+=ssl3_handshake_mac(s,ctx2,sender,len,p); |
---|
525 | return(ret); |
---|
526 | } |
---|
527 | |
---|
528 | static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx, |
---|
529 | const char *sender, int len, unsigned char *p) |
---|
530 | { |
---|
531 | unsigned int ret; |
---|
532 | int npad,n; |
---|
533 | unsigned int i; |
---|
534 | unsigned char md_buf[EVP_MAX_MD_SIZE]; |
---|
535 | EVP_MD_CTX ctx; |
---|
536 | |
---|
537 | EVP_MD_CTX_init(&ctx); |
---|
538 | EVP_MD_CTX_copy_ex(&ctx,in_ctx); |
---|
539 | |
---|
540 | n=EVP_MD_CTX_size(&ctx); |
---|
541 | npad=(48/n)*n; |
---|
542 | |
---|
543 | if (sender != NULL) |
---|
544 | EVP_DigestUpdate(&ctx,sender,len); |
---|
545 | EVP_DigestUpdate(&ctx,s->session->master_key, |
---|
546 | s->session->master_key_length); |
---|
547 | EVP_DigestUpdate(&ctx,ssl3_pad_1,npad); |
---|
548 | EVP_DigestFinal_ex(&ctx,md_buf,&i); |
---|
549 | |
---|
550 | EVP_DigestInit_ex(&ctx,EVP_MD_CTX_md(&ctx), NULL); |
---|
551 | EVP_DigestUpdate(&ctx,s->session->master_key, |
---|
552 | s->session->master_key_length); |
---|
553 | EVP_DigestUpdate(&ctx,ssl3_pad_2,npad); |
---|
554 | EVP_DigestUpdate(&ctx,md_buf,i); |
---|
555 | EVP_DigestFinal_ex(&ctx,p,&ret); |
---|
556 | |
---|
557 | EVP_MD_CTX_cleanup(&ctx); |
---|
558 | |
---|
559 | return((int)ret); |
---|
560 | } |
---|
561 | |
---|
562 | int ssl3_mac(SSL *ssl, unsigned char *md, int send) |
---|
563 | { |
---|
564 | SSL3_RECORD *rec; |
---|
565 | unsigned char *mac_sec,*seq; |
---|
566 | EVP_MD_CTX md_ctx; |
---|
567 | const EVP_MD *hash; |
---|
568 | unsigned char *p,rec_char; |
---|
569 | unsigned int md_size; |
---|
570 | int npad,i; |
---|
571 | |
---|
572 | if (send) |
---|
573 | { |
---|
574 | rec= &(ssl->s3->wrec); |
---|
575 | mac_sec= &(ssl->s3->write_mac_secret[0]); |
---|
576 | seq= &(ssl->s3->write_sequence[0]); |
---|
577 | hash=ssl->write_hash; |
---|
578 | } |
---|
579 | else |
---|
580 | { |
---|
581 | rec= &(ssl->s3->rrec); |
---|
582 | mac_sec= &(ssl->s3->read_mac_secret[0]); |
---|
583 | seq= &(ssl->s3->read_sequence[0]); |
---|
584 | hash=ssl->read_hash; |
---|
585 | } |
---|
586 | |
---|
587 | md_size=EVP_MD_size(hash); |
---|
588 | npad=(48/md_size)*md_size; |
---|
589 | |
---|
590 | /* Chop the digest off the end :-) */ |
---|
591 | EVP_MD_CTX_init(&md_ctx); |
---|
592 | |
---|
593 | EVP_DigestInit_ex( &md_ctx,hash, NULL); |
---|
594 | EVP_DigestUpdate(&md_ctx,mac_sec,md_size); |
---|
595 | EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad); |
---|
596 | EVP_DigestUpdate(&md_ctx,seq,8); |
---|
597 | rec_char=rec->type; |
---|
598 | EVP_DigestUpdate(&md_ctx,&rec_char,1); |
---|
599 | p=md; |
---|
600 | s2n(rec->length,p); |
---|
601 | EVP_DigestUpdate(&md_ctx,md,2); |
---|
602 | EVP_DigestUpdate(&md_ctx,rec->input,rec->length); |
---|
603 | EVP_DigestFinal_ex( &md_ctx,md,NULL); |
---|
604 | |
---|
605 | EVP_DigestInit_ex( &md_ctx,hash, NULL); |
---|
606 | EVP_DigestUpdate(&md_ctx,mac_sec,md_size); |
---|
607 | EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad); |
---|
608 | EVP_DigestUpdate(&md_ctx,md,md_size); |
---|
609 | EVP_DigestFinal_ex( &md_ctx,md,&md_size); |
---|
610 | |
---|
611 | EVP_MD_CTX_cleanup(&md_ctx); |
---|
612 | |
---|
613 | for (i=7; i>=0; i--) |
---|
614 | { |
---|
615 | ++seq[i]; |
---|
616 | if (seq[i] != 0) break; |
---|
617 | } |
---|
618 | |
---|
619 | return(md_size); |
---|
620 | } |
---|
621 | |
---|
622 | int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p, |
---|
623 | int len) |
---|
624 | { |
---|
625 | static const unsigned char *salt[3]={ |
---|
626 | #ifndef CHARSET_EBCDIC |
---|
627 | (const unsigned char *)"A", |
---|
628 | (const unsigned char *)"BB", |
---|
629 | (const unsigned char *)"CCC", |
---|
630 | #else |
---|
631 | (const unsigned char *)"\x41", |
---|
632 | (const unsigned char *)"\x42\x42", |
---|
633 | (const unsigned char *)"\x43\x43\x43", |
---|
634 | #endif |
---|
635 | }; |
---|
636 | unsigned char buf[EVP_MAX_MD_SIZE]; |
---|
637 | EVP_MD_CTX ctx; |
---|
638 | int i,ret=0; |
---|
639 | unsigned int n; |
---|
640 | |
---|
641 | EVP_MD_CTX_init(&ctx); |
---|
642 | for (i=0; i<3; i++) |
---|
643 | { |
---|
644 | EVP_DigestInit_ex(&ctx,s->ctx->sha1, NULL); |
---|
645 | EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i])); |
---|
646 | EVP_DigestUpdate(&ctx,p,len); |
---|
647 | EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]), |
---|
648 | SSL3_RANDOM_SIZE); |
---|
649 | EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]), |
---|
650 | SSL3_RANDOM_SIZE); |
---|
651 | EVP_DigestFinal_ex(&ctx,buf,&n); |
---|
652 | |
---|
653 | EVP_DigestInit_ex(&ctx,s->ctx->md5, NULL); |
---|
654 | EVP_DigestUpdate(&ctx,p,len); |
---|
655 | EVP_DigestUpdate(&ctx,buf,n); |
---|
656 | EVP_DigestFinal_ex(&ctx,out,&n); |
---|
657 | out+=n; |
---|
658 | ret+=n; |
---|
659 | } |
---|
660 | EVP_MD_CTX_cleanup(&ctx); |
---|
661 | return(ret); |
---|
662 | } |
---|
663 | |
---|
664 | int ssl3_alert_code(int code) |
---|
665 | { |
---|
666 | switch (code) |
---|
667 | { |
---|
668 | case SSL_AD_CLOSE_NOTIFY: return(SSL3_AD_CLOSE_NOTIFY); |
---|
669 | case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE); |
---|
670 | case SSL_AD_BAD_RECORD_MAC: return(SSL3_AD_BAD_RECORD_MAC); |
---|
671 | case SSL_AD_DECRYPTION_FAILED: return(SSL3_AD_BAD_RECORD_MAC); |
---|
672 | case SSL_AD_RECORD_OVERFLOW: return(SSL3_AD_BAD_RECORD_MAC); |
---|
673 | case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE); |
---|
674 | case SSL_AD_HANDSHAKE_FAILURE: return(SSL3_AD_HANDSHAKE_FAILURE); |
---|
675 | case SSL_AD_NO_CERTIFICATE: return(SSL3_AD_NO_CERTIFICATE); |
---|
676 | case SSL_AD_BAD_CERTIFICATE: return(SSL3_AD_BAD_CERTIFICATE); |
---|
677 | case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE); |
---|
678 | case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED); |
---|
679 | case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED); |
---|
680 | case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN); |
---|
681 | case SSL_AD_ILLEGAL_PARAMETER: return(SSL3_AD_ILLEGAL_PARAMETER); |
---|
682 | case SSL_AD_UNKNOWN_CA: return(SSL3_AD_BAD_CERTIFICATE); |
---|
683 | case SSL_AD_ACCESS_DENIED: return(SSL3_AD_HANDSHAKE_FAILURE); |
---|
684 | case SSL_AD_DECODE_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); |
---|
685 | case SSL_AD_DECRYPT_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); |
---|
686 | case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE); |
---|
687 | case SSL_AD_PROTOCOL_VERSION: return(SSL3_AD_HANDSHAKE_FAILURE); |
---|
688 | case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE); |
---|
689 | case SSL_AD_INTERNAL_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); |
---|
690 | case SSL_AD_USER_CANCELLED: return(SSL3_AD_HANDSHAKE_FAILURE); |
---|
691 | case SSL_AD_NO_RENEGOTIATION: return(-1); /* Don't send it :-) */ |
---|
692 | default: return(-1); |
---|
693 | } |
---|
694 | } |
---|
695 | |
---|